Other Parts Discussed in Thread: LM5145
Hi,
My customer use TPS40200 for 42V input and 5V7A output. I can't find a close ref design and this device is unavaiable in WEBENCH. Please help to review this design. thanks.
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Hi Yue,
The design looks good. I would check compensation given the ESR of the 220uF electrolytic output cap.
Also, given that the current is 7A, you might consider a synchronous buck solution for better efficiency / lower power loss. My recommendation in that case is the LM5145.
Regards,
Tim
Tim,
Thanks again. their setting is as attachedTPS40KType III Loop Stability kVenable_sluc263c-071312.7z. I have a few questions:
1.comparing to the table, their compensation part is different. do you think is this a right way to decide the compenstation part?
2. will the wrong compenstaion impact the drive waveform of MOSFET?
Hi Yue,
Either the venable method or the conventional voltage-mode compensator design (for example, see the LM5145 datasheet) is acceptable. As long as the regulator is stable, the drive waveform should not be affected.
Regards,
Tim